html {
    --bg: #fff;
    --bg-secondary: #f8f9fa;
    --headings: #000;
    --text: #333;
    --links: blue;
    --highlight: #ffecb2; // light yellow
}
@mixin dark-appearance {
  html, body  {
      --bg: #1f242A;
      --bg-secondary: #323945;
      --headings: #3D9970;
      --text: #adb5bd;
      --links: #91a7ff;
      --highlight: #ffd8a8;
      --highlight: #ffd43b;
  };
}
html[data-theme="dark"] { @include dark-appearance; }

@media (prefers-color-scheme: dark) {
  body[data-theme="auto"] { @include dark-appearance; }
}

html { height: 100%; }

body {
  font-family: monospace;
  font-size: 1rem;
  line-height: 1.5;
  margin: 0;
  min-height: 100%;
}

h2, h3, h4, h5 { margin-top: 1.5em; }

hr { margin: 1em 0; }

p { margin: 1em 0; }

li { margin: 0.4em 0; }

.w {
  max-width: 640px;
  margin: 0 auto;
  padding: 4em 2em;
}

table, th, td {
  width: 100%;
  border: thin solid black;
  border-collapse: collapse;
  padding: 0.4em;
}

div.highlighter-rouge code, code.highlighter-rouge {
  display: block;
  overflow-x: auto;
  padding: 1em;
}

blockquote {
  font-style: italic;
  border: thin solid black;
  padding: 1em;

  p { margin: 0; }
}

img {
  max-width: 100%;
  display: block;
  margin: 0 auto;
}

html, body {
    background-color: var(--bg);
    color: var(--text);
}
h1, h2, h3, h4, h5, h6 {
    color: var(--headings);
}
p, strong, b, em, span, small, li, hr, table, code, figcaption {
    color: var(--text);
}
code, blockquote {
  background-color: var(--bg-secondary);
  border: 1px var(--text) solid;
}
a {
  color: var(--links);
}
*:target { background-color: var(--bg-secondary); }

html.transition,
html.transition *,
html.transition *:before,
html.transition *:after {
    transition: all 250ms !important;
    transition-delay: 0 !important;
}

.theme-toggle {
  color: var(--text);
  background-color: transparent;
  padding: 4px;
  cursor: pointer;
  margin: 1em;
  position: fixed;
  right: 0;
  top: 0;
  border: 2px transparent solid;
  outline: none;
}

.theme-toggle:hover {
  color: var(--links);
  outline: none;
}
.theme-toggle:focus {
  outline: none;
}
.dashed {
  border-top: 1px var(--text) dashed;
  margin: 0.5em 0;
}
mark {
  padding: 0.4em;
  background-color: var(--highlight);
  font-size: 0.8em;
}